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I added the remark field for GuestsByEvent in general (not only for
Lino Avanti.

I moved some code from lino.modlib.changes.models to a new
module lino.utils.watch. Because the fact of declaring
something to be watched is different from how this watching is to be
done. Apllication code must replace:

fromlino.modlib.changes.modelsimportwatch_changesaswc

by:

fromlino.utils.watchimportwatch_changesaswc

The advantage is that an application can define change watchers, and
local system administrators can still decide to disable the
lino.modlib.changes plugin.